AU8863698A - Process for the preparation of 2-alkylthiobenzonitrile derivatives - Google Patents
Process for the preparation of 2-alkylthiobenzonitrile derivatives Download PDFInfo
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- AU8863698A AU8863698A AU88636/98A AU8863698A AU8863698A AU 8863698 A AU8863698 A AU 8863698A AU 88636/98 A AU88636/98 A AU 88636/98A AU 8863698 A AU8863698 A AU 8863698A AU 8863698 A AU8863698 A AU 8863698A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/14—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Saccharide Compounds (AREA)
Abstract
A process for preparing a compound of the formula:which comprises reacting a compound of the formula:wherein R3 is nitro or halo, with a compound of formula R1S-X wherein X is hydrogen or alkali metal.
Description
WO 99/02490 PCT/EP98/04948
-I
PROCESS FOR THE PREPARATION OF 2-ALKYLTHIOBENZONITRILE DERIVATIVES 5 This invention relates to a process for preparing certain 2-alkylthio substituted benzonitriles, which are useful as chemical intermediates, for example in the preparation of herbicidally active compounds. 2-Alkylthio-substituted benzonitriles are intermediates in the preparation of agrochemicals such as herbicides, for example as 10 described in EP 0527036. It is desirable to provide such compounds in high yields and also to develop new procedures which allow the efficient displacement of 2-nitro or 2-halo substituted benzonitriles to furnish 2 alkylthio substituted benzonitriles. The present invention seeks to provide a high yielding process for 15 preparing 2-alkylthio substituted benzonitriles. Thus, the present invention provides a process for preparing a 2-alkylthio-substituted-benzonitrile derivative of formula (I): CN SRI R4
R
2 (I) 20 wherein R 1 represents C1- 6 alkyl; WO 99/02490 PCTIEP98/04948 -2
R
2 represents C 1
-
6 haloalkyl, C1- 6 alkyl. C 1
-
6 haloalkoxy, C 1 -6 alkoxy, SOnR 5 or halogen;
R
4 represents hydrogen, C1- 6 haloalkoxy, C 1
-
6 alkoxy, SOnR 5 or halogen; or a 5 or 6-membered heterocyclic ring (which may be 5 unsaturated or partially saturated) containing 1 to 3 hetero atoms selected from oxygen, nitrogen and sulphur, optionally substituted by halogen, C1- 6 haloalkyl, C1- 6 alkyl, C1- 6 haloalkoxy, C1- 6 alkoxy, SOnR5, nitro or cyano;
R
5 represents C 1-6 alkyl; and 10 n represents 0, 1 or 2; which comprises reacting a compound of formula (II): CN R3 R4 R2 (II) wherein R 2 and R 4 are as hereinbefore defined and R 3 represents 15 nitro or a halogen atom selected from fluorine, chlorine and bromine, with a compound of formula R 1 S-X, wherein R 1 is as hereinbefore defined and X is hydrogen or an alkali metal.
WO 99/02490 PCT/EP98/04948 -3 When R 4 represents a heterocyclic ring, preferred rings include 3-isoxazolyl, 5-isoxazolyl, 2-thiazolyl, 5-oxazolyl, 2-fury), 3-furyl, 2 thienyl and 3-thienyl. RI preferably represents methyl. 5 R 2 preferably represents trifluoromethyl.
R
3 preferably represents nitro or chlorine.
R
4 preferably represents hydrogen. X preferably represents a sodium, potassium or lithium atom. In an especially preferred embodiment of the invention R 1 10 represents C 1-6 alkyl (methyl is most preferred);
R
2 represents C 1-6 haloalkyl (trifluoromethyl is most preferred);
R
3 represents nitro or a halogen atom selected from fluorine, chlorine and bromine (nitro or chlorine are most preferred); and
R
4 represents hydrogen. 15 The above reaction to prepare compounds of formula (I) by the reaction of a compound of formula (II) with a compound of formula
R
1 S-X may be performed using various solvents such as aromatic hydrocarbons for example toluene or xylene, ethers such as 20 tetrahydrofuran, dioxan or tert-butyl methyl ether; amides such as N,N dimethylformamide; sulphoxides such as dimethylsulphoxide; or ketones, for example methyl ethyl ketone or acetone. An especially WO 99/02490 PCT/EP98/04948 -4 preferred solvent is acetone, optionally in the presence of water. It has been found that the reaction proceeds in excellent yield using these conditions. A preferred compound of formula R 1 S-X is sodium 5 thiomethoxide, which may be used in dry solid form or conveniently as a solution in water. Where X is hydrogen, a base is generally present in the reaction mixture. Examples of suitable bases are alkali metal or alkaline earth metal carbonates, alkoxides or hydrides such as potassium carbonate, 10 potassium t-butoxide or sodium hydride, or amidine bases such as 1,8 diazabicyclo[5.4.0]undec-7-ene or 1,1,3,3-tetramethylguanidine. The reaction is generally performed at a temperature from about -20 0 C to about 120 0 C preferably from about 100 to about 60 0 C and most preferably from about 100 to about 40oC. 15 The molar ratio of the benzonitrile derivative of formula (II): alkyl thiol (or metal salt thereof) of formula R 1 S-X is generally from about 1:1 to about 1:4, preferably from about 1:1 to about 1:2.5 and most preferably from about 1:1 to about 1:1.2. Optionally the reaction may be performed in a two phase system 20 consisting of water and another solvent which has low solubility in water, in the presence a phase transfer catalyst. Examples of phase transfer catalysts which are suitable include ammonium salts such as tetrabutylammonium chloride; phosphonium salts such as WO 99/02490 PCT/EP98/04948 -5 tributylhexadecylphosphonium bromide; guanidinium salts such as hexaethylguanidinium chloride or hexamethylguanidinium chloride; or crown ethers such as 18-crown-6. Suitable solvents for use with water and the phase transfer catalyst include aromatic hydrocarbons for 5 example toluene or xylene, ethers such as tert-butyl methyl ether, halogenated solvents such as chlorobenzene or dichloromethane, generally employed in admixture with water. The quantity of phase transfer catalyst employed is generally from a 2 to 10% molar ratio (relative to the molar amount of compound of formula (II)). When 10 conducted under these conditions the reaction is generally carried out at a temperature of from about 5oC to about 100C, preferably from about 250 to about 70 0 C. The following non-limiting examples illustrate the invention. 15 Example 1 Preparation of 2 -methylthio-4-trifluoromethylbenzonitrile Sodium thiomethoxide (366g of a 21% aqueous solution, 1.1M) was added during 3 hours to a solution of 2-nitro-4 trifluoromethylbenzonitrile (220.5g, 1.0M) in acetone (340g) with 20 stirring at 20-30oC. Stirring was continued for a further 1 hour and the two liquid phases separated. The upper layer ( a solution of the product in acetone) was kept at 20 0 C when 2-methylthio-4- WO 99/02490 PCT/EP98/04948 -6 trifluoromethylbenzonitrile crystallised (213g), m.p.82oC. The yield was 97 %, with product purity >96%. Example 2 5 Methanethiol (278g, 5.78M) was added during 20 minutes to a stirred mixture of acetone (5 litres) and potassium carbonate (593g, 4.29M) at -15 0 C. A solution of 2-nitro-4-trifluoromethylbenzonitrile (618g, 2.86M) in acetone (500ml) was added during 10 minutes. The mixture was allowed to warm to 20oC with stirring for 23 hours and then 10 heated at 55oC for 2 hours to remove most of the methanethiol and then flushed with nitrogen for 4 hours. The mixture was poured onto ice/water, the solid filtered off, washed and dried to give 2-methylthio 4-trifluoromethylbenzonitrile (550g). The yield of product was 89%. 15 Example 3 Sodium thiomethoxide (37g of a 21% aqueous solution, 0.11 M) was added during 2 hours to a solution of 2-chloro 4-trifluoromethylbenzonitrile (20.56g, 0.099M) in acetone (34g) with stirring at 30-35 0 C. After a further 2.5 hours at 30-35 0 C and 3 hours at 20 60'C, a further addition of sodium thiomethoxide (3.4g of a 21% aqueous solution, 0.01 M) was made. The mixture was maintained at 60 oC for 2 hours, cooled and the organic phase evaporated to give 2- WO 99/02490 PCT/EP98/04948 -7 methylthio-4-trifluoromethylbenzonitrile (20.3g), m.p.800C. The yield of product was 91%, with a purity of 97%. Compounds of formulae (II) and (III) and processes for their preparation are known or may be prepared by known methods. Both the 5 compounds of formula (I) above and the herbicidally active compounds which they may be used to prepare are described in the literature, for example in European Patent Publication Nos. 0418175, 0527036,or WO/9500476.
Claims (11)
1. A process for the preparation of a compound of formula (I): CN SRI R4 R2 5 (i) wherein R 1 represents C1- 6 alkyl R 2 represents C 1- 6 haloalkyl, C 1 - 6 alkyl, C 1 - 6 haloalkoxy, C 1 -6 alkoxy, SOnR 5 or halogen; R 4 represents hydrogen, C 1 - 6 haloalkoxy. C 1 - 6 alkoxy. SOnR 5 or 10 halogen; or a 5 or 6-membered heterocyclic ring (which may be unsaturated or partially saturated) containing 1 to 3 hetero atoms selected from oxygen. nitrogen and sulphur, optionally substituted by halogen, C 1- 6 haloalkyl, C 1 - 6 alkyl, C 1 - 6 haloalkoxy. C 1- 6 alkoxy, SOnR5, nitro or cyano; 15 R 5 represents C1- 6 alkyl; and n represents 0, 1 or 2; which comprises reacting a compound of formula (II): WO 99/02490 PCT/EP98/04948 -9 CN 4 R 2 (II) wherein R 2 and R 4 are as hereinbefore defined and R 3 represents nitro or a halogen atom selected from fluorine, chlorine and bromine, 5 with a compound of formula R 1 S-X, wherein R 1 is as hereinbefore defined and X is hydrogen or an alkali metal.
2. A process according to claim 1 in which R 1 represents C 1 -6 alkyl; R 2 represents C 1-6 haloalkyl; and R 4 represents hydrogen.
3. A process according to claim 1 or 2 in which R 1 represents 10 methyl, R2 represents trifluoromethyl and R 4 represents hydrogen.
4. A process according to any one of claims 1 to 3 in which R 3 represents nitro or chlorine.
5. A process according to any one of claims 1 to 4 in which X represents a sodium, potassium or lithium atom. 15
6. A process according to any one of the preceding claims in which the reaction is performed in a solvent selected from aromatic hydrocarbons, ethers, amides, sulphoxides, ketones and mixtures thereof.
7. A process according to claim 6 in which the solvent is 20 acetone, optionally in the presence of water. WO 99/02490 PCTIEP98/04948 - 10
8. A process according to any one of the preceding claims in which the molar ratio of the compound of formula (II): compound of formula R 1 IS-X is from about 1:1 to about 1:4.
9. A process according to claim 8 in which the molar ratio of 5 the compound of formula (II): compound of formula R 1 S-X is from about 1:1 to about 1:2.5.
10. A process according to claim 1 substantially as hereinbefore described in any one of Examples 1 to 3.
11. A compound of formula (I) as defined in claim 1 when 10 prepared by a process according to any one of the preceding claims.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9714306.9A GB9714306D0 (en) | 1997-07-07 | 1997-07-07 | New processes |
GB9714306-9 | 1997-07-07 | ||
PCT/EP1998/004948 WO1999002490A1 (en) | 1997-07-07 | 1998-07-03 | Process for the preparation of 2-alkylthiobenzonitrile derivatives |
Publications (2)
Publication Number | Publication Date |
---|---|
AU8863698A true AU8863698A (en) | 1999-02-08 |
AU756271B2 AU756271B2 (en) | 2003-01-09 |
Family
ID=10815495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU88636/98A Ceased AU756271B2 (en) | 1997-07-07 | 1998-07-03 | Process for the preparation of 2-alkylthiobenzonitrile derivatives |
Country Status (17)
Country | Link |
---|---|
US (1) | US6506926B1 (en) |
EP (1) | EP0994852B1 (en) |
JP (1) | JP4172612B2 (en) |
KR (1) | KR100573559B1 (en) |
CN (1) | CN1143846C (en) |
AT (1) | ATE253553T1 (en) |
AU (1) | AU756271B2 (en) |
BR (1) | BR9810687B1 (en) |
CA (1) | CA2295910A1 (en) |
DE (1) | DE69819504T2 (en) |
GB (1) | GB9714306D0 (en) |
HU (1) | HU228842B1 (en) |
IL (1) | IL133815A (en) |
PL (1) | PL337895A1 (en) |
TW (1) | TW528744B (en) |
WO (1) | WO1999002490A1 (en) |
ZA (1) | ZA985771B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1773921B1 (en) * | 2004-06-07 | 2010-09-01 | Battelle Memorial Institute | Synthesis of nanoparticles in non-aqueous polymer solutions and product |
CN107540583A (en) * | 2017-08-23 | 2018-01-05 | 连云港世杰农化有限公司 | A kind of method for synthesizing the trifluoromethylbenzoic acid ethyl ester of 2 methyl mercapto 4 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8920519D0 (en) | 1989-09-11 | 1989-10-25 | Rhone Poulenc Ltd | New compositions of matter |
GB9116834D0 (en) | 1991-08-05 | 1991-09-18 | Rhone Poulenc Agriculture | Compositions of new matter |
FR2706893B1 (en) | 1993-06-23 | 1995-08-04 | Rhone Poulenc Agrochimie | |
US5633384A (en) * | 1994-07-05 | 1997-05-27 | Sumitomo Seika Chemicals Co., Ltd. | Method for producing 1,2-benzisothiazol-3-ones |
-
1997
- 1997-07-07 GB GBGB9714306.9A patent/GB9714306D0/en active Pending
-
1998
- 1998-07-01 ZA ZA9805771A patent/ZA985771B/en unknown
- 1998-07-03 JP JP2000502019A patent/JP4172612B2/en not_active Expired - Lifetime
- 1998-07-03 EP EP98940257A patent/EP0994852B1/en not_active Expired - Lifetime
- 1998-07-03 BR BRPI9810687-2A patent/BR9810687B1/en not_active IP Right Cessation
- 1998-07-03 HU HU0003321A patent/HU228842B1/en unknown
- 1998-07-03 KR KR1020007000045A patent/KR100573559B1/en not_active IP Right Cessation
- 1998-07-03 WO PCT/EP1998/004948 patent/WO1999002490A1/en active IP Right Grant
- 1998-07-03 DE DE69819504T patent/DE69819504T2/en not_active Expired - Lifetime
- 1998-07-03 TW TW087110790A patent/TW528744B/en not_active IP Right Cessation
- 1998-07-03 US US09/462,177 patent/US6506926B1/en not_active Expired - Lifetime
- 1998-07-03 PL PL98337895A patent/PL337895A1/en not_active Application Discontinuation
- 1998-07-03 IL IL13381598A patent/IL133815A/en not_active IP Right Cessation
- 1998-07-03 CN CNB988069644A patent/CN1143846C/en not_active Expired - Lifetime
- 1998-07-03 CA CA002295910A patent/CA2295910A1/en not_active Abandoned
- 1998-07-03 AU AU88636/98A patent/AU756271B2/en not_active Ceased
- 1998-07-03 AT AT98940257T patent/ATE253553T1/en active
Also Published As
Publication number | Publication date |
---|---|
AU756271B2 (en) | 2003-01-09 |
PL337895A1 (en) | 2000-09-11 |
JP2001509502A (en) | 2001-07-24 |
US6506926B1 (en) | 2003-01-14 |
BR9810687A (en) | 2000-08-22 |
GB9714306D0 (en) | 1997-09-10 |
KR100573559B1 (en) | 2006-04-24 |
BR9810687B1 (en) | 2009-08-11 |
WO1999002490A1 (en) | 1999-01-21 |
IL133815A (en) | 2005-07-25 |
IL133815A0 (en) | 2001-04-30 |
EP0994852B1 (en) | 2003-11-05 |
EP0994852A1 (en) | 2000-04-26 |
TW528744B (en) | 2003-04-21 |
CN1143846C (en) | 2004-03-31 |
JP4172612B2 (en) | 2008-10-29 |
DE69819504D1 (en) | 2003-12-11 |
ZA985771B (en) | 2000-01-18 |
KR20010015546A (en) | 2001-02-26 |
HUP0003321A2 (en) | 2001-02-28 |
CN1267283A (en) | 2000-09-20 |
DE69819504T2 (en) | 2004-11-04 |
CA2295910A1 (en) | 1999-01-21 |
HUP0003321A3 (en) | 2002-02-28 |
HU228842B1 (en) | 2013-06-28 |
ATE253553T1 (en) | 2003-11-15 |
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